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Fair Value Measurements - Financial Instruments Not Reported at Fair Value (Details) - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Assets (liabilities) |  |
Mortgage loans | $ 20,484.2 | $ 20,142.8
Policy loans | 867.5 | 809.3
Reinsurance deposit receivable | 4,897.5 | 6,078.6
Short-term debt | (152.7) | (61.1)
Long-term debt | (3,955.3) | (3,930.9)
Carrying amount |  |
Assets (liabilities) |  |
Mortgage loans | 20,343.6 | 20,142.8
Policy loans | 867.5 | 809.3
Other investments | 294.9 | 268.6
Cash and cash equivalents not required to be reported at fair value | 1,261.4 | 936.3
Reinsurance deposit receivable | 4,897.5 | 6,078.6
Cash collateral receivable | 3.0 | 38.7
Investment contracts | (34,140.3) | (33,937.9)
Short-term debt | (152.7) | (61.1)
Long-term debt | (3,933.5) | (3,930.9)
Separate account liabilities | (157,939.3) | (152,229.2)
Bank deposits | (440.4) | (399.5)
Cash collateral payable | (428.9) | (176.9)
Assets (liabilities) measured at fair value |  |
Assets (liabilities) |  |
Mortgage loans | 18,466.5 | 18,505.0
Policy loans | 879.3 | 846.3
Other investments | 292.4 | 260.9
Cash and cash equivalents not required to be reported at fair value | 1,261.4 | 936.3
Reinsurance deposit receivable | 4,401.9 | 5,487.7
Cash collateral receivable | 3.0 | 38.7
Investment contracts | (32,922.2) | (32,166.7)
Short-term debt | (152.7) | (61.1)
Long-term debt | (3,715.7) | (3,754.5)
Separate account liabilities | (157,010.7) | (151,280.9)
Bank deposits | (442.1) | (385.3)
Cash collateral payable | (428.9) | (176.9)
Assets (liabilities) measured at fair value | Fair value hierarchy Level 1 |  |
Assets (liabilities) |  |
Cash and cash equivalents not required to be reported at fair value | 1,238.5 | 913.9
Cash collateral receivable | 3.0 | 38.7
Cash collateral payable | (428.9) | (176.9)
Assets (liabilities) measured at fair value | Fair value hierarchy Level 2 |  |
Assets (liabilities) |  |
Other investments | 127.5 | 142.9
Cash and cash equivalents not required to be reported at fair value | 22.9 | 22.4
Investment contracts | (8,306.5) | (7,828.1)
Short-term debt | (152.7) | (61.1)
Long-term debt | (3,713.2) | (3,754.1)
Bank deposits | (442.1) | (385.3)
Assets (liabilities) measured at fair value | Fair value hierarchy Level 3 |  |
Assets (liabilities) |  |
Mortgage loans | 18,466.5 | 18,505.0
Policy loans | 879.3 | 846.3
Other investments | 164.9 | 118.0
Reinsurance deposit receivable | 4,401.9 | 5,487.7
Investment contracts | (24,615.7) | (24,338.6)
Long-term debt | (2.5) | (0.4)
Separate account liabilities | $ (157,010.7) | $ (151,280.9)

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- Definition This item represents investment contracts such as guaranteed investment contracts and funding arrangements that do not have significant insurance risk. This item excludes any embedded derivatives within investment host contracts that are required to be reported at fair value. + References No definition available. + Details
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- Definition The aggregate of all deposit liabilities held by the entity, including foreign and domestic, interest and noninterest bearing; may include demand deposits, saving deposits, Negotiable Order of Withdrawal (NOW) and time deposits among others. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 942 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(12)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478546/942-210-S99-1 + Details
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- Definition Amount before allowance of loans made to policy and contract holders using their life insurance contracts' cash value or separate accounts as collateral. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums over and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(1)(e)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478777/944-210-S99-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(1)(6)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478777/944-210-S99-1 + Details
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